myahgoss
myahgoss myahgoss
  • 10-02-2018
  • Mathematics
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qumpelka
qumpelka qumpelka
  • 10-02-2018
The answer is 4 cm. 

You have got a right-angled triangle. 

Use the Pythagorean theorem. 
The most common triangle is 3 x 4 x 5. 
So if the short side is 3, and the hypotenuse is 5, the long side HAS TO BE 4.
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